144 JOURNAL OF THE ROYAL HORTICULTURAL SOCIETY. 



Cranberry Insect Problems and Suggestions for Solving Them. By H. B. 



Scammell (U.S.A. Dep. Agr. Bur. Entom., Farm. Bull. 860, Dec. 1917; 

 38 figs.). — An abundant water supply, permitting flooding and reflooding at 

 the proper times, is the best remedy for insect injury in cranberry bogs, and 

 when sites for new bogs are chosen this should be borne in mind. — V, G. J. 



Cyanide Fumigation. By H. J. Quayle (Jour. Econ. Entom. vol. xi. June 1918, 

 pp. 294-299). — A most interesting paper to those concerned with fumigation of 

 trees under sheets in the field. Emphasizes the difficulty of properly fumigating 

 the lower portion of large trees, without injuring the top : owing to HCN which, 

 when superheated by the reaction, rises at once to the top of the tent or sheet. 

 Formula 2, under tent data on page 298, is wrongly quoted : it should read 

 C O 



( 2 — C (-144) ). The error is obviously a printer's error, as the equation stated 

 would not give tent volume. — G. W. G. 



Diascia Aliciae Hiern. By S. A. Skan (Bot. Mag. t. 8782; 1918). — Scrophu- 

 lariaceae. Native of South Africa. A herbaceous perennial up to 2\ feet high, 

 not hardy in this country. Leaves opposite, ovate, dentate-serrate. Flowers 

 borne in terminal racemes 2 to 10 inches long, pale rose, with darker blotches 

 at the base of each Hp, greenish inside the pouch. — L. C. E. 



Double Flowers and Sex Linkage in Begonia. By W. Bateson and I. Sutton 

 (Jour. Gen. 8, pp. 199-207; pi. ; June 1919). — The results of an investigation 

 into the meaning of doubling in Begonias are given. Both garden forms and 

 the wild species Begonia Davisii were used, and the conclusion to which the 

 results point — viz. that all the pollen grains carry the factor for doubling, as 

 do the pollen grains of certain strains of stocks — is remarkable in a wild species. 



F. J. C. 



Drying Plant, A Successful Community. By C. W. Pugsley (U.S.A. 

 Dep. Agr., Farm. Bull. 916, Dec. 1917; 9 figs.). — A successful community drying 

 plant for fruit and vegetables is described in this bulletin. Municipalities might 

 well establish plants from public funds, a small charge being made for use 

 of plant at the rate of so much per tray, which would defray the initial expense 

 and pay for the upkeep and working expenses. — V. G. J. 



Echeveria setosa Rose. By M. L. Green (Bot. Mag. t. 8748; 1918). — Cras- 

 sulaceae. Native of Mexico. A greenhouse succulent. The leaves are very 

 numerous, probably a hundred or more, crowded together in a dense rosette. 

 The inflorescence is scorpioid, either simple or forked. The flowers are red 

 towards the base and yellow above. — L, C. E. 



Erlangea aggregata. By J. Hutchinson (Bot. Mag. t. 8755; 1918). — Com- 

 positae. Native of Angola. A perennial plant for the greenhouse, attaining a 

 height of 5 to 6 feet. The flower heads are densely clustered, blue flushed with 

 rose. In this country it flowers in midwinter. It can be easily propagated by 

 cuttings from which full-sized plants can be grown in a single season. — L. C. E. 



Fumigation Experiments : The Time Factor. By A. F. Swain (Jour. Econ. 

 Entom. vol. xi. June 1918, pp. 320-324). — The experiments here enumerated go to 

 prove that with ordinary 8 oz. U.S. Army duck, or similar type of fumigation 

 sheets, an exposure of 45 minutes to the action of HCN gas is as efficient in insect 

 control as any other length of exposure. The reason for this is mainly the 

 diffusion of the gas through the material forming the tent or sheet ; and the 

 remarks do not apply to fumigation under an impervious material. The writer's 

 experience of fumigation under similar conditions confirms the conclusions reached 

 by the author. — G. W. G. 



Ginkgo, Monoecious* Corporal J. Platts (Gard. Chron. April 12, 1919) states, in 

 an account of the Botanic Garden at Bonn, that he saw an interesting specimen of 

 Ginkgo biloba about 20 feet high, and divided about 6 feet from the ground by a 

 crotch ; one half of the tree is male, the other half female, the latter being weighted 

 down with fruit. The monoecious character was entirely natural and not the 

 result of either budding or grafting, and he failed to see any indications of either. 



It may be added that Elwes and Henry in " Trees of Great Britain " mention 

 a similar tree at Vienna, but in this case the female was grafted on the male tree 

 (vol. i. p. 57). — Gerald Loder. 



